Timing of deglacial Atlantic meridional overturning variability from a high-resolution seawater cadmium reconstruction
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A new, high-resolution record of benthic seawater Cd (Cdw) was generated from a Florida Straits-region sediment core. The record provides additional evidence for Cdw below modern values at this location during the Younger Dryas and Heinrich Stadial 1- climatological periods associated with glacial melt. These results support the interpretation of changes in Cdw in the region as indicative of the strength of Atlantic Meridional Overturning Circulation (AMOC). Lower Cdw values imply a weaker AMOC, reducing the northward intrusion of higher-nutrient southern-sourced water. Comparison of this new Cdw record with previously published neodymium isotope and δ18O records from the same core shows synchronous transitions, further illustrating the connection between nutrient levels and AMOC strength in the Florida Straits. An increase in Cdw near 16 ka implies a resumption of AMOC strength approximately midway through Heinrich Stadial 1, coincident with evidence of hydrological changes shown in several climate records.